Fait mathématique: 25667 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Culture générale: 25667 is an uninteresting number.
Date historique: April 9th is the day in 1981 that the U.S. Navy nuclear submarine USS George Washington (SSBN-598) accidentally collides with the Nissho Maru, a Japanese cargo ship, sinking it.